Patent GB-191023768-A (GB)
Title: Improvements in or relating to Jacks for use in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
IPC: A43D21/00
Filed: 1910-10-13
Granted: 1911-10-12
Abstract: 23,768. Boult, A. J., [United Machinery Co.]. Oct. 13. Lasting. - A lasting-machine of the type described in Specification 11,131/03 is provided with means for keeping the heel-band parallel : with the bottom of the shoe during the lasting operation. The heel carriage 8, which is adjustable relatively to the toe carriage 2 by a right and left handed screw 14, has ears 18, between which is pivoted a support 20 for the last pin 10. A spring plunger 24 in the support 20 normally holds the last pin tipped away from the heel band. The carriage 8 is provided on either side with lugs 34, to which is pivoted a casting 37 carrying curved spring arms 40, which at their ends are pivoted to the heel-band. The middle rear part of the heel-band is connected by an adjustable support 42 with a lever 44 fulcrumed on one of the spring-arms 40. The pivot 12* of the heel-band is situated a short distance back from the ends of the band, so that as the band is rocked about its pivot during the lasting operation its front ends rise. The heelband is adjusted relatively to the last by manually adjusting the casting 37, which is maintained in position by a pawl and ratchet. The shoe is depressed into a position in which its bottom face is flush with the upper edge of the heel-band, by a depressing-piece 43 operated by a handle 45. The toe carriage 2 is provided with a guide-way for a longitudinally-movable post 50, to which is connected a carrier 52. The carrier 52 is provided with a socket for the vertically-adjustable toe-rest 60. The toe band 6 is supported by a holder comprising a block 64 connected by a pivot pin 66 to the front end of the carrier 52, and provided at its lower end with laterally extending lugs 68, upon which are pivoted bars 70 for sustaining spring arms 72, connected at their upper ends to the toeband. The front of the toe-band is connected to the block by links 75. The rear ends of the bars 70 are connected by a right and left handed screw for closing and opening the band. The post 50 is provided with rack teeth 74 engaged by a pinion 76 carried by a shaft 78, which is turned by a handle 80. The handle 80 carries a locking pawl engaging with teeth on a disk 84. A spring 86 causes the toe-band to be depressed when the pawl is released. To adapt the toe-band for use with twisted lasts, the block 64 is formed with a bearing for a short shaft 90, having at its rear end an eccentric 92 working in a slot in the carrier 52. The shaft 90 carries a hand-wheel 94 locked by a spring pawl 96. By turning the wheel 94, the block 64 may be moved about its pivot 66 and then the toeband set parallel to the bottom face of a twisted last. The post 50 is connected to the lever 44 by a bar 98, which is secured to the former and passes through a slot in the latter. By this means, as the toe rest is raised to force the shoe back into the heel-band, the heel-band is rocked through the connexions 98, 44, 42 and is maintained in a position parallel with the heel surface of the last.